Supported electrode metal radio tube



March 20, 1951 A. BINNEWEG, JR

SUPPORTED ELECTRODE METAL RADIO TUBE Filed Nov. 24, 1947 Patented Mar.20, 1951 SUPPORTED ELECTRODE METAL RADIO TUBE Abraham Binneweg, Jr.,Oakland, Calif.

Application November 24, 1947, Serial No. 787,785

' The present invention relates to a radio tube having a metal envelope,ordinarily here used as the anode, and other electrodes within saidenvelope one or more of which electrodes are supported by both the leadto the electrode and an auxiliary means of support such as a pillar ofinsulation in which a stiff wire is imbedded for a short distance. Ifthe electrode is made stifi, however, it may not need the auxiliarymeans of support.

As objects and advantages of this invention:

An object of this invention is to simplify the manufacture of strong.and compact ultra-high radio-frequency radio tubes employing simplemeans for lead entry and generally a simple construction.

Another object is to provide simple airtight radio tubes having metalenvelopes.

An object is to produce better metal'tubes for ultra-high frequencies.

An added object is to provide properly supported electrodes within metalenvelopes.

And a combined object is to produce better metal radio tubes forultra-high radio frequencies having rigid internal support as well asshort and direct leads to the outside so reducing capacity between leadsand between leads and envelope of the radio tube.

My tube as described and illustrated differs from former tubes instructure and design with electrodes more compactly arranged than in theordinary tube. Essentially the tube is a shallow metal box with aninsulating cover and flattened electrodes, the bottom of the box itselfforming the anode. Special inserts in opposite walls for leads makepossible a still more compact and eflicient tube with reduced capacityeffects.

Fig. 1 is a vertical view of one form of the invention showing bentelectrodes supported as shown. 22 is the exhaust tube in Fig. 1.

Fig. 2 is a vertical view of another form of the invention showing theelectrode leads entering from opposite sides of the envelope.

Fig. 3 is a vertical view of another form of the invention showing topand side lead entry to the electrodes. The grid is bent in this form ofthe invention.

Fig. 4 is a vertical view showing both sides as entrances for the leadsto the electrodes.

In each of the four drawings as listed above, the electrodes have anauxiliary means of electrode support in addition to the lead thatsupports the electrode and brings the current to it. It is obvious that,if the electrode leads are very stifi, no auxiliary supports may beneeded for any of the electrodes.

2 Claims. (01. 25027.5)

, Fig. 5 is a plan view of a radio tube illustrating the invention. Fig.1, Fig. 2, Fig. 3, and Fig. 4 have square envelopes as shown in planview of Fig. 5.

, The entering insulators to any of the radio tubes illustrated, arecircular as in perspective view in Fig. 6, which shows a lead sealed inthe insulator, or square as in perspective view Fig. '7 which may alsohave a lead sealed into it as shown for the insulator of Fig. 6.

Fig. 8 is a perspective view of a cathode 4 supported on a lead 5a whichis imbedded in an insulating rod 6.

Fig. 9 is a vertical partially sectioned view of a grid electrode suchas shown in Fig. 10 perspective view of the same grid without the endbend 24.

Fig. 11 shows a cathode in perspective with a lead attached at itscenter, while Fig. 12 also shows a cathode in perspective having a leadattached at one end, and also a lead attached to its center which leadmay be bent as shown.

- The cathode many of the radio tubes are simple metal cylinders havinginternal electric heaters which have two external leads l2 and I3. Themetal cylinder of the cathode is covered with electron-emitting materialas usual.

Fig. 1 shows the metal envelope I, the glass insulator 2 having twoleads sealed in it as shown. See Fig. 6 for a sealed lead construction.3 is a metal ring around and on the glass insulator which ring is sealedby soldering it airtight, to the metal envelope all around. A bent leadsupports the grid which is nearest the fiat wall of the envelope, and arod support 1B also supports the end of the grid 8. Fig. 10' shows thegrid 8 with a hole in its end into which the rod is expanded or rivetedto hold the grid end. A hole is drilled on the inside of the metalenvelope wall, the insulating supporting rod is then driven tightly intothis hole. The hole in the end of the grid is fitted over the rod. InFig. 1, the insulator 6 with metal lead 5a of Fig. 8 is used to supportthe cathode or cathode lead.

Fig. 2, I a the metal envelope, 2a the top and bottom circularinsulators shown in Fig. 6, grid 8 near the wall with bent lead, andcathode 4 near it, also with bent lead. I is a support as in Fig. 1(insulator 6 of Fig. 8) and 6 is an insulator as in Fig. 8 having a wire5d (as in Fig. 8) imbedded in an insulating rod. Rings of metal aresoldered over on to the metal of the radio tube. Note that in Fig. 2insulators 2a are smaller than the insulator 2 in Fig. 1. In Fig. 2,metal pieces are welded inside the envelope to reduce the size of theinsulator openings. 25 are welds in Fig. 1 and In Fig. 4, the cathode 4has a side insulator 2b.

and the grid 8 which is the lowest electrode, also has a side insulator2b.

The heater leads are all brought out the top of the envelopes. Fig. 5 isa plan view showing envelope Id, and insulator 2a in the wall. Grid'fiais supported by insulating pillar 7 andgride-lead;

9. Grid wires II] are shown plainly.

The assembly of this radio tube is asfollows: For example, in Fig. 1, itis necessary to cut an opening '20 in theenvelope, adjust'and arrangethe electrodesand insulators, then to weld the opening shut again, carebeing taken that the welding heat does not damage the insulators byholding that part of the envelope under Water while the welding is beingdone. In Fig. 5', a hole Zla in the bottom ofthe. envelope showshoweasily the assembly is madethrough thehole 2,! a. The hole is thenwelded closed from the outside of theenvelope.

In Fig. 1, insulators'lb and 6 are first arranged in the envelope, thenthe assembly consisting of insulator 2 supporting the grid and cathodeleads and electrodesis set ,downinto the envelope, and,

sealed airtight such as by solderingthe metallizing of this hard glassto the top rim of the;al1oy metal envelope. Previously, a hole 20,hadbeen burned, or otherwise formed in the bottom of the: Small toolscan bepassed through envelope. opening 20 to form a head .onthe end ofrodlb to so hold the-grid in place. to the cathode or cathode lead. Itis always possible toopen the envelope atone or'more places and'socomplete theinternal electrode-assembly;

of these radio tubes.

The metal envelopes are cast or formed of metal materialof a suitablekindsuch asany opening. This insulator has a metallized ring around itsoutside which rim is soldered to the envelope all around. Fig. 2 isasimilarenvelope having top and bottominsulators setin,- ina. similarmanner. Fig. 3 .is similar having a top insulator and an, insulator 2bcementedin a holev in; the sideof the envelope. Fig. 4. has :two in:

5a is also Welded 4 l sulators 25 set in, one on each side, like theinsulator 2b of Fig. 3.

Fig. 5 shows a grid mounted on an insulating peg for additional supportover the metal base. Circular grids or anodes are supported also oninsulating supports as illustrated.

The present design gives the heat generated a large area fordissipation. Leads are short and direct with very high frequencyoperation. En-

. velopes have a flat area near the grid.

I claim:

1'. A radio tube comprising a shallow metallic receptacle, the bottom ofwhich constitutes an anode, an insulating cover for said receptaclerendering it air-tight, insulating inserts in opposite Walls-.cfsaid-receptacle, a flattened grid above the .bottom of said receptacleand parallel thereto, a stiff lead attached to one end of said grid andpassing through one of said inserts, a short insulating pegattached' tothe bottomof said receptacle and supporting the other end of said grid,a cathode parallel to the cover ofsaidreceptacle, a cathode lead passingthrough the other of said insertsand filament 'leads'passing' from saidcathodethrough the cover of said tube. 2. A radio tube'comprising ashallow-metallicreceptacle, the. bottom of which constitutes an anode,an insulating cover for said receptacle rendering it air-tight,insulating inserts in 01)- posite walls of said receptacle, a flattenedgrid above the bottom of said receptacle and parallel thereto, a stifflead attached to oneend of'said' grid and'passing through one of saidinserts, a

short insulating peg attached to the bottomof' said receptacle andsupporting the other endof said grid, a cathode parallelto thecover ofsaid receptacle, a cathode, lead passing throughthe other of saidinserts, filamentleadspassing from said. cathode through the, coverofsaidtube, and

a metalring encircling the insulatingcoverand,

overlapping the lip of said metal receptacle and soldered thereto.

ABRAHAM'BINNEWEG, JR.

REFERENCES. CITED The following references are of recorcl'in the fileofthis patent:

UNITED STATES 1 PATENTS Number. Name Date.

1,716,930 Prindle June 11, 1929 1,906,458 Franklin ,May 2, 19332,000,567 McCullough May 7, 1935-. 2,150,379 Kerschbaum May 14, 1939-2,163,409 Pulfrich June 20, ,1939. 2,165,135 Garner July 1,19392,229,957 Crawford Jan..28,.1941

